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Turning Point Mine (Rainbow claims; Monarch Mine; Golden Wonder Mine; Camino property), Tat Momoli area, Casa Grande Mining District, Slate Mts, Tohono O'odham Indian Reservation, Pinal Co., Arizona, USAi
Regional Level Types
Turning Point Mine (Rainbow claims; Monarch Mine; Golden Wonder Mine; Camino property)Mine
Tat Momoli areaArea
Casa Grande Mining DistrictMining District
Slate MtsMountain Range
Tohono O'odham Indian ReservationReservation
Pinal Co.County

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Latitude & Longitude (WGS84):
32° 36' 0'' North , 111° 53' 47'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
Vaiva Vo128 (2011)13.4km
Chuichu269 (2011)19.9km
Arizona City10,475 (2011)27.3km
Anegam151 (2011)28.2km
Stanfield740 (2011)32.0km

A former surface and underground Pb-Ag-Cu-Au-V-Mo-Zn mine located in sec. 36, T9S, R4E, adjoining the Jack Rabbit Mine on the W., and located about 2¾ miles W of Tat Momoli (Jackrabbit). Discovered 1898 and produced 1898-1946. Owned by O. T. Manning, E. L. Harris, & W. M. Mischer. Operators included O.T. Manning, F.C. Manning, and Bartlett McNatt. Additional names which apply to this locality: Tuba City Mining and Milling Co. property; Southern Arizona Mines Inc. property; Turning Point Aended MS 1353 patented claim; SW Desert Enterprises property; Legal Tender Amended MS 1353 patented claim; Golden Wonder Amended MS 1353 patented claim.

Mineralization is a vein deposit in a NE-striking, 65SE-dipping normal fault, hosted in Escabrosa Limestone, dipping 60E. Ore concentration was supergene enrichment. Ore control was a limestone cap as a barrier and andesite permeability. The highest grade ore was in andesite porphyry. Mineralization weakens downward. An associated rock unit is andesite

Workings include levels at 74, 154, 184, and 215 feet; surface trenching. A 10 stamp mill was built in 1902. Production included some high grade ore stoped and shipped in 1911. The mine worked intermittently until 1946. 1913 reported recovery of metals in amalgam and concentrates was about 60%. Values were $6-7/ton; sometimes over $100/ton.

The greatest potential for further production probably lies in the 600 feet of unexplored vein partially exposed NE of the shaft. The vein split junction 300 feet NE of the shaft would provide a likely target for exploration. A search for the western extension of the Turning Point vein W of the N-striking, W-dipping fault against which past operations ceased, might be profitable.

Assay data: $18/t Au and Ag in 1880-1900 (period values).

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert
Tohono O'odham Indian Reservation, Arizona, USAReservation

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

5 valid minerals.

Detailed Mineral List:

Formula: PbZn(VO4)(OH)
Habit: Tiny
Colour: Red
Description: Crystals coating vanadinite.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 201.
Formula: PbS
Reference: MRDS database Dep. ID #10102392, MRDS ID #M000048.
Formula: Au
Reference: MRDS database Dep. ID #10102392, MRDS ID #M000048.
Formula: Pb5(VO4)3Cl
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 201.
Formula: Zn2SiO4
Reference: MRDS database Dep. ID #10102392, MRDS ID #M000048.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Group 2 - Sulphides and Sulfosalts
Group 8 - Phosphates, Arsenates and Vanadates
Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] coordination

List of minerals for each chemical element

H DescloizitePbZn(VO4)(OH)
O DescloizitePbZn(VO4)(OH)
O VanadinitePb5(VO4)3Cl
O WillemiteZn2SiO4
Si WillemiteZn2SiO4
S GalenaPbS
Cl VanadinitePb5(VO4)3Cl
V DescloizitePbZn(VO4)(OH)
V VanadinitePb5(VO4)3Cl
Zn DescloizitePbZn(VO4)(OH)
Zn WillemiteZn2SiO4
Au GoldAu
Pb DescloizitePbZn(VO4)(OH)
Pb VanadinitePb5(VO4)3Cl
Pb GalenaPbS


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Tenny, J.B. (1927-1929) History of Mining in Arizona, Special Cllection, University of Arizona Library & Arizona Bureau of Mines Library: 337-338.
Tenney, J.B. (1934) Economic Geological Reconnaissance of Casa Grande Mining District. Arizona Bureau of Mines: 22-23.
US Atomic Energy Commission Preliminary Reconnaissance Report 172-488 (1953): 8.
Hammer (1961) Geology and Ore Deposits of the Jackrabbit area, Pinal County, Arizona. MS thesis, University of Arizona.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 201.
U.S. Bureau of Mines file data.
USGS 1 minute Silver Reef Mountains Quadrangle map.
U.S. Bureau of Land Management Mining District Sheet 556.
Arizona Department of Mineral Resources Turning Point file.
Arizona Department of Mineral Resources Camino Mine file.
Arizona Department of Mineral Resources Southern Arizona Mines, Inc. file.
Arizona Department of Mineral Resources Desert Queen file.
Arizona Department of Mineral Resources Jack Rabbit file.
Arizona Department of Mineral Resources U files.
MRDS database Dep. ID #10102392, MRDS ID #M000048; and Dep. ID #10162022, MAS ID #0040210845.

USGS MRDS Record:10102392
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